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| author | Julian Wiedmann <jwi@linux.ibm.com> | 2018-05-02 08:48:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-22 16:57:57 +0200 |
| commit | 252bbeb9688a3c6ede9ea997e93ecb5d05e60209 (patch) | |
| tree | f7efa604e8165813bc80d0e5722a7302b26821ea /drivers | |
| parent | 270693b978f345c34509676c0729d72c19b6d87e (diff) | |
| download | linux-stable-252bbeb9688a3c6ede9ea997e93ecb5d05e60209.tar.gz linux-stable-252bbeb9688a3c6ede9ea997e93ecb5d05e60209.tar.bz2 linux-stable-252bbeb9688a3c6ede9ea997e93ecb5d05e60209.zip | |
s390/qdio: fix access to uninitialized qdio_q fields
commit e521813468f786271a87e78e8644243bead48fad upstream.
Ever since CQ/QAOB support was added, calling qdio_free() straight after
qdio_alloc() results in qdio_release_memory() accessing uninitialized
memory (ie. q->u.out.use_cq and q->u.out.aobs). Followed by a
kmem_cache_free() on the random AOB addresses.
For older kernels that don't have 6e30c549f6ca, the same applies if
qdio_establish() fails in the DEV_STATE_ONLINE check.
While initializing q->u.out.use_cq would be enough to fix this
particular bug, the more future-proof change is to just zero-alloc the
whole struct.
Fixes: 104ea556ee7f ("qdio: support asynchronous delivery of storage blocks")
Cc: <stable@vger.kernel.org> #v3.2+
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/cio/qdio_setup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c index 48b3866a9ded..3da5f3f3cf8b 100644 --- a/drivers/s390/cio/qdio_setup.c +++ b/drivers/s390/cio/qdio_setup.c @@ -140,7 +140,7 @@ static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues) int i; for (i = 0; i < nr_queues; i++) { - q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL); + q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL); if (!q) return -ENOMEM; |